Karvonen, J, EL Kokkonen, and E Ruotsalainen. “311 Nm UVB Lamps in the Treatment of Psoriasis With the Ingram Regimen”. Acta Dermato-Venereologica 69, no. 1 (January 1, 1989): 82–85. Accessed July 1, 2026. https://medicaljournalssweden.se/actadv/article/view/4611.